The GARO Status Monitor says "Cannot Acquire Status" of the printer while the printer is turned on.
USB Connection
According to Canon Support, this is probably due to the IPF5000 having more stringent requirements for the USB voltage than some other devices. If your USB port does not fully comply with those standards, the computer may lose communication with the printer. Apparently, there is nothing in the USB protocol to allow the computer to reacquire communication. Cable was about 15 feet, but Canon said length of cable was not the problem.
Workarounds: One of these will probably work for you.
Unplug the USB cable for a couple of seconds and plug it back in. This worked for one poster, which according to Canon probably confirms that the voltage on the USB port is the problem.
Rebooting the computer may solve the problem (worked for same user).
Change connection to Ethernet.
Note: Canon recommends not using a USB connection in conjunction with Standby mode (readme for windows printer driver 3.41).
Ethernet Connection
One poster reported still having the problem occasionally even on Ethernet connection. The only solution was to temporarily turn off (power cycle) the printer. Simply rebooting the computer did not fix the problem. It could also be the router, assuming you are using a local router. Sometimes the cabling is bad or intermittent. I would advise also cycling the power on the router if one is used.
The GARO Status Monitor says "Cannot Acquire Status" of the printer while the printer is turned on.
USB Connection
According to Canon Support, this is probably due to the IPF5000 having more stringent requirements for the USB voltage than some other devices. If your USB port does not fully comply with those standards, the computer may lose communication with the printer. Apparently, there is nothing in the USB protocol to allow the computer to reacquire communication. Cable was about 15 feet, but Canon said length of cable was not the problem.
Workarounds: One of these will probably work for you.
Note: Canon recommends not using a USB connection in conjunction with Standby mode (readme for windows printer driver 3.41).
Ethernet Connection
One poster reported still having the problem occasionally even on Ethernet connection. The only solution was to temporarily turn off (power cycle) the printer. Simply rebooting the computer did not fix the problem. It could also be the router, assuming you are using a local router. Sometimes the cabling is bad or intermittent. I would advise also cycling the power on the router if one is used.